Organic waste gas catalytic combustion treatment device

Organic waste gas catalytic combustion treatment device

catalytic combustion

The method of using catalysts to reduce combustion temperature and accelerate the oxidation of toxic and harmful gases during chemical reactions is called catalytic combustion. Due to the fact that the carrier of the catalyst is made of porous material with a large specific surface area and suitable pore size, when the organic gas heated to 300-450 ℃ passes through the catalytic layer, oxygen and organic gas are adsorbed on the catalyst on the surface of the porous material, increasing the chance of contact and collision between oxygen and organic gas, improving activity, and causing a violent chemical reaction between organic gas and oxygen to generate CO2 and H2O, while generating heat, thereby making the organic gas non-toxic and harmless.

activated charcoal

Activated carbon is a type of carbon that has been specially treated by heating organic materials (such as fruit shells, coal, wood, etc.) under isolated air conditions to reduce non carbon components (this process is called carbonization), and then reacting with gas to corrode the surface and produce a structure with well-developed micropores (this process is called activation). Due to the fact that the activation process is a microscopic process, where a large amount of molecular carbides corrode the surface in a point like manner, numerous small pores are formed on the surface of activated carbon. The diameter of micropores on the surface of activated carbon is mostly between 2-50nm. Even a small amount of activated carbon has a huge surface area, with a surface area of 500-1500m2 per gram of activated carbon. Almost all applications of activated carbon are based on this characteristic of activated carbon.

adsorption

Utilizing the physical properties of activated carbon to adsorb VOC organic waste gas, and the honeycomb shaped activated carbon has a large specific surface area and strong adsorption capacity, adsorbing organic waste gas into the micropores of activated carbon, thereby purifying the gas. The purified gas is then discharged through a fan, achieving the effect of organic waste gas treatment;

desorption

When the micropores of activated carbon are saturated with adsorption, it can no longer be adsorbed. At this time, the high-temperature hot air generated by the catalytic bed is used to desorb the activated carbon. The organic matter in the micropores of activated carbon will automatically detach from the activated carbon when exposed to high temperature, thus regenerating the activated carbon. The desorbed organic matter has been concentrated (with a concentration several tens of times higher than before) and sent to the catalytic combustion chamber for catalytic combustion. It is catalytically oxidized on the catalyst at 250-300 ℃ to convert it into harmless CO2 and H2O, which are discharged. When the concentration of organic waste gas reaches 2000ppm or more, the organic waste gas can maintain spontaneous combustion in the catalytic bed without further heating. Part of the exhaust gas after combustion is directly discharged into the atmosphere, and most of the hot air flow is recycled to the adsorption bed for desorption and regeneration of activated carbon. This can not only meet the heat energy requirements for combustion and desorption, but also achieve the goal of energy conservation. The regenerated activated carbon can be used for the next adsorption.

catalytic combustion

The method of using catalysts to reduce combustion temperature and accelerate the oxidation of toxic and harmful gases is called catalytic combustion. Due to the fact that the carrier of the catalyst is made of porous material with a large specific surface area and suitable pore size, when the organic gas heated to 300-450 ℃ passes through the catalytic layer, oxygen and organic gas are adsorbed on the catalyst on the surface of the porous material, increasing the chance of contact and collision between oxygen and organic gas, improving activity, and causing a violent chemical reaction between organic gas and oxygen to generate CO2 and H2O, while generating heat, thereby making the organic gas non-toxic and harmless.

Activated carbon adsorption desorption catalytic combustion equipment

working principle

Designed based on the two basic principles of high adsorption efficiency, catalytic combustion, and energy saving, it adopts multi gas path continuous operation, with two activated carbon adsorption boxes working alternately and one catalytic combustion chamber. The first activated carbon adsorption box adsorbs exhaust gas, and stops the adsorption operation when it reaches saturation, and immediately performs desorption treatment. At the same time, the second activated carbon adsorption box is used for adsorption concentration. When it reaches saturation, the adsorption operation is stopped and desorption treatment is immediately carried out. Similarly, the subsequent sets of activated carbon adsorption boxes will undergo the same adsorption and desorption process as the first set of activated carbon adsorption boxes. These desorbed organic waste gases have been concentrated (with a concentration several tens of times higher than before) and sent to the catalytic combustion chamber for catalytic combustion. The catalytic oxidation reaction, also known as "combustion," is carried out on the catalyst at high temperatures of 250-350 ℃, converting the organic waste gases into harmless CO2 and H2O for discharge. When the concentration of organic waste gas reaches over 2000PPm, the organic waste gas can maintain its natural state in the catalytic bed without external heating, and most of the exhaust gas after combustion is discharged into the atmosphere.

Organic waste gas catalytic combustion treatment device

Performance characteristics of catalytic combustion:

The device is designed with advanced principles, uses high-quality materials, has stable performance, is easy to operate, safe and reliable, and has no secondary pollution. The equipment has a small footprint and is lightweight. The adsorption bed adopts a drawer type structure, which is easy to load and easy to replace. b、 Adopting a new type of activated carbon adsorbent material - honey like activated carbon, which has advantages in thermodynamic properties, low resistance, high adsorption rate, etc. compared to granular (rod) form, it is extremely suitable for high air volume use. c、 The catalytic combustion chamber uses precious metal catalysts with ceramic honeycomb bodies, which have low resistance and can operate normally with a low-pressure fan. It not only consumes less power but also has low noise. d、 The air volume of the catalytic combustion device is one tenth of the exhaust gas source air volume, and the heating power is maintained for about 1 hour, saving energy. e、 The activated carbon bed that adsorbs organic waste gas can use the heat generated by catalytic combustion to desorb and regenerate the waste gas. The desorbed gas is then sent to the catalytic combustion chamber for purification without the need for additional energy, resulting in low operating costs and energy savings. f、 An automatic emergency fire sprinkler system is installed inside the activated carbon adsorption bed to ensure system safety.

Catalytic combustion

① In order to prevent clogging of the catalyst bed and catalyst poisoning, it is necessary to perform pre-treatment on the exhaust gas before entering the bed to remove dust, droplets, and catalyst toxins from the exhaust gas.

② Preheating equipment includes exhaust gas preheating equipment and catalyst burner preheating equipment. Due to the catalytic activity temperature of catalysts, which is called the catalyst ignition temperature for catalytic combustion, it is necessary to adjust the temperature of the exhaust gas and bed to reach the ignition temperature before catalytic combustion can be carried out. Therefore, it is necessary to set up preheating equipment. But for situations where the exhaust gas itself has a high temperature, such as enameled wires, insulation materials, baking paint, etc., and the temperature can reach over 300 ℃, there is no need to install preheating equipment.
The hot gas heated by the preheating equipment can be obtained by using a heat exchanger and laying pipes inside the bed. The heat source for the preheater can be flue gas or electric heating, with electric heating being more commonly used nowadays. After the initial catalytic reaction, the recovered reaction heat can be used as much as possible to preheat the exhaust gas. In situations with high reaction heat, waste heat recovery equipment should also be installed to save power.
The temperature of the heat source for preheating exhaust gas generally exceeds the activity temperature of the catalyst. To protect the catalyst, the heating equipment should maintain a certain distance from the catalytic combustion equipment, which can also make the exhaust gas temperature distribution uniform.
Starting from the point of preheating demand, catalytic combustion method is more suitable for continuous exhaust purification. If intermittent exhaust is used, not only does it consume energy for each preheating demand, but the reaction heat cannot be recovered and reused, which will result in significant power waste. This should be taken into account when planning and selecting.

③ Catalytic combustion equipment generally uses fixed bed catalytic reactors. The planning of the reactor should be carried out in accordance with regulations, and should be easy to operate, repair conveniently, and facilitate the loading and unloading of catalysts.
When planning the process of catalytic combustion, a modular process should be planned based on the detailed situation. For situations with large gas processing capacity, the preheater and reactor should be independently installed and connected by pipelines. For situations with low gas processing capacity, a catalytic combustion furnace can be used to combine preheating and reaction, but attention should be paid to the distance between the preheating section and the reaction section.

Catalytic combustion method

1. Regenerative Catalytic Oxidation (RCO), abbreviated as RCO, is an effective method for purifying hydrocarbon waste gas and eliminating odors by decomposing VOCs into CO2 and H2O at low temperatures of 200-400 ℃ under the action of a catalyst.

2. RCO has the characteristics of efficient energy recovery from RTO (Thermal Storage Incinerator) and low-temperature operation of catalytic reactions. By placing the catalyst on top of the thermal storage material, the purification can achieve excellent results, with a heat recovery rate of up to 95%.

3. The key to the excellent performance of RCO systems is the use of precious metal or transition metal catalysts impregnated on saddle shaped or honeycomb shaped ceramics, where oxidation occurs at low temperatures, reducing fuel consumption and equipment costs.

4. There are four main types of VOCs waste gas catalytic combustion processes used in engineering applications: regenerative catalytic combustion, heat recovery catalytic combustion, direct combustion catalytic combustion, and adsorption concentration catalytic combustion.

Quality and Service

1. Free design services

Professional engineers personally visit the site, conduct on-site surveys, carefully understand customer service requirements, solicit customer installation design opinions, and provide * design solutions based on the customer's actual situation.

2. Careful installation service

Professional construction personnel strictly install according to industry standards; Clearly explain the usage precautions to the user and ask them to check and sign for feedback.

3. Equipment debugging service

During the on-site installation and commissioning of the equipment, if any abnormal conditions occur (such as equipment damage, malfunction, failure to meet technical specifications or equipment manual indicators), we will replace or repair it as soon as possible free of charge without delaying the construction period. During the debugging and operation of the equipment, if it is found that the functionality and performance of any equipment system do not meet the requirements of the technical specifications due to our responsibility, or if the equipment stops running due to equipment failure, we will make corresponding repairs within 24 hours.

4. Training services

To ensure that the equipment provided by us performs as planned during operation, free training will be provided to users

5. Warranty period service

We provide a one-year warranty service for all hardware devices that have been automatically debugged in real-time. During the warranty period, we will promptly repair any faulty hardware (excluding equipment damage caused by human factors or natural disasters beyond our control). Upon receiving notification of equipment failure, our company promises to arrive at the site within 24 hours to troubleshoot.

Company Introduction:

Jiangsu Yaoxian Environmental Equipment Co., Ltd. specializes in the research, development, design, and consulting of air pollution control technology. In multiple fields of the air pollution control industry, relying on independently developed high-quality products, we provide solutions with our own core technologies.

The company mainly produces air pollution control equipment: organic waste gas adsorption desorption regeneration device RTO, thermal storage incineration purification device, catalytic combustion purification device RCO, steam desorption condensation recovery device, plasma purification device, acid-base waste gas purification tower, toxic and harmful waste gas absorption tower, stainless steel combustion tower, photocatalytic oxidation device, high-voltage electrostatic device, odor gas biological deodorization complete set equipment, industrial oil fume purifier, dust treatment system. The products are widely used in the photovoltaic industry, solar cells, electronic semiconductors, metallurgy, iron and steel, organic metallurgy, pharmaceutical and chemical industry, municipal environmental protection and other national large and medium-sized enterprises. With advanced technology, mature processes and timely and thoughtful after-sales service, it has achieved excellent results and won high praise from many domestic and foreign enterprises.

At the time of its establishment, the company established the concept of people-oriented and technology driven development, always with the mission of "focusing on the environmental protection industry, intellectual energy conservation and emission reduction, and improving the ecological environment". It fulfills its social responsibility around its main business and creates a truly green, pollution-free, low-carbon ecological environment.